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Yes, you can find TDC by finding compression stroke and piston at TDC #1 hole.
Technically, it's done with a piston stop screwed into the spark plug hole and a degree wheel. You turn the crank until the piston stops somewhat short of tdc and mark/note the degree wheel reading. Turn the crank 360- and stop the piston on the other side and note the degree wheel. TDC is right between the two numbers on the degree wheel!
That being said, the engine should run, timed by reference to crankshaft sensor on flywheel, when the cam/crank are properly indexed. Timing marks off the wall or moving/changing are the result of a bad harmonic balancer. I'm on my third balancer in 133K miles (last one went on at 120K or so, including the original one). Dunno what kills those things except maybe heat and oil contamination.
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